Adiabatic process :
The word adiabatic has been taken from Latin word adiabatic mean impossible.
. The process in which the amount of heat can not enter the system or leave itvsuch process is known as adiabatic process.
"OR"
. The process in which the amount of heat remains constant this is called adiabatic process.
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. Consider the given figure in which a system placed on an insulator. When the load placed on the piston is released then expansion taken place in it. Due to this expansion the internal energy of system gets converted into work done.
. Due to expansion the work done is positive and the internal energy is negative.
. Noe by using the equation of 1st law of thermodynamics.
ΔQ = Δu + Δw. ΔQ = 0
- Δu = Δw This is equation for adiabatic expansion.
. When the compression takes place then the work is done on the system and the internal energy of the system gets increased.
-Δw = Δu
. In this process.
i). The amount of heat remain constant i. e ΔQ = 0.
ii). The internal energy increases due to compression and the internal energy decrease due to expansion.
iii). The work done is positive due to expansion and it is negative due to compression.
iv). It obeys the modified from of boyle's law due to slight change in temperature.
. Modified form of boyle's law is given
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v). Adiabatic process takes place very rapidly ( due to in order to change slight change in ΔT).
vi). The value of specific heat capacity due to adiabatic due to adiabatic process is zero because we have n't suppling Amount of heat to the system.
Graph of adiabatic process.
The graph of adiabatic process is curved line b/w the axes of pressure and volume but this curved line is isothermal
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